*{
    margin: 0px;
    padding: 0px;
    font-family: "微软雅黑";
}
a{
    text-decoration:none;
}
ul {
    list-style: none;
}
/*版心*/
.bx{
    width: 980px;
    margin: 0 auto;
}

/*在有该类的元素内部元素的前面和后面添加元素*/
.clearfix:before, .clearfix:after {
    content: "";
    display: table;
}
/*只要after两侧有浮动元素，after就会跑到最下面，从而撑开带有该类名的父盒子*/
.clearfix:after {
    clear: both;
}
/*用于兼容IE/7/6*/
.clearfix {
    *zoom: 1;
}